dos33fsprogs/games/sb/hgr_copy_fast.s

	; special case
	;=========================================================
	; hgr copy from $A000/$8000 to current DRAW_PAGE
	;=========================================================

	; would be faster if we unroll it, but much bigger

	; old numbers

	; 14+ ((14*256)+20)*32 + 5 = 115347 = 8.6fps

	; theoretical unrolled, 30*6 bytes bigger (180 bytes?)
	; 2 + ((9*32)+5)*256 + 5 = 75015 = 13.3 fps

hgr_copy:
	; copy from in A ($80/$A0)

	sta	hgr_copy_smc+2			; 4
	clc
	adc	#$20
	sta	hgr_copy_end_smc+1

;	lda	#$A0				; 2

	ldx	#0				; 2



	lda	DRAW_PAGE
	clc
	adc	#$20
	sta	hgr_copy_smc+5			; 4

hgr_copy_column:

hgr_copy_smc:
	lda	$8000,X				; 4
	sta	$2000,X				; 5

	dex					; 2
	bne	hgr_copy_column			; 2nt/3t



	inc	hgr_copy_smc+2			; 6
	inc	hgr_copy_smc+5			; 6

	lda	hgr_copy_smc+2			; 4
hgr_copy_end_smc:
	cmp	#$C0				; 2
	bne	hgr_copy_column			; 2/3

	rts					; 6